Enhancing the sensitivity of poly(methyl methacrylate) based optical fiber Bragg grating temperature sensors

Wei Zhang*, David J. Webb, Gang-Ding Peng

*Corresponding author for this work

Research output: Contribution to journalLetter, comment or opinion

Abstract

In poly(methyl methacrylate) (PMMA)-based optical fiber gratings (POFBGs), the temperature response is determined by thermal expansion and the thermo-optic effect of the fiber. Because thermal expansion introduces a positive change and the thermo-optic effect introduces a negative change in the Bragg wavelength of the POFBG, they cancel out each other to some extent, leading to reduced and varying temperature sensitivity. By pre-straining a POFBG, the contribution of thermal expansion can be removed, and, consequently, the temperature sensitivity of POFBG can be greatly enhanced. Theoretical analysis also indicates a reduced thermo-optic coefficient of POFBG due to restrained linear expansion that matches experimental results.

Original languageEnglish
Pages (from-to)4046-4049
Number of pages4
JournalOptics Letters
Volume40
Issue number17
Early online date7 Jul 2015
DOIs
Publication statusPublished - 7 Aug 2015

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